package top.byteio.gateway.config;

import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import reactor.core.publisher.Mono;

import java.util.Objects;

/**
 * 路由限流配置类
 *
 * @author lengleng
 * @date 2019/2/1
 */
@Configuration(proxyBeanMethods = false)
public class RateLimiterConfiguration {

	/**
	 * 创建基于远程地址的KeyResolver实例
	 * @see <a href="https://docs.spring.io/spring-cloud-gateway/docs/current/reference/html/#the-requestratelimiter-gatewayfilter-factory">Spring
	 * Cloud Gateway文档</a>
     * @return org.springframework.cloud.gateway.filter.ratelimit.KeyResolver 根据请求的远程地址生成限流key的KeyResolver
     * @author lerryxia
     **/
	@Bean
	public KeyResolver keyResolver() {
		return exchange -> Mono
			.just(Objects.requireNonNull(Objects.requireNonNull(exchange.getRequest().getRemoteAddress()))
				.getAddress()
				.getHostAddress());
	}

}
